A motor self-test method based on coaxial motor

Abstract

This invention relates to the field of motor testing technology, specifically to a self-testing method for motors based on coaxial motors. This invention utilizes mutual testing between coaxial motors: by including two or more coaxial motors in a motor group, one coaxial motor is used to test another. This method replaces the brake used in traditional drag testing with a generator connected to a resistor box, simplifying the testing process and reducing costs. Load torque is adjusted by adjusting the load resistance: according to the motor equations, only the load resistance needs to be adjusted to adjust the load torque. This method makes load adjustment more convenient and improves testing flexibility.

Description

Technical Field

[0001] The present invention relates to the technical field of motor testing, and in particular to a motor self-testing method based on a coaxial motor. Background Art

[0002] The motor is one of the indispensable and important equipment in modern industrial production and life. It is widely used in various mechanical equipment to provide power. When the motor leaves the factory, the performance parameters of the motor need to be tested. In order to ensure the normal operation of the motor, it needs to be tested and maintained regularly. The traditional motor testing method usually connects the motor and the torque sensor and the load through the mechanical shaft, and tests the performance of the motor by changing the load. In addition, some motors use the coaxial motor design, that is, two or more motors share one shaft to improve the efficiency and performance of the motor.

[0003] In the prior art, see Figure 5 The motor, torque sensor and load are all connected through mechanical shafts. Although this design can effectively test the performance of the motor, when replacing the motor, all mechanical shafts need to be removed, and the operation process is cumbersome and time-consuming.

[0004] There are still some problems with the existing technology in practical applications. When testing high-power motors, the existing motor testing method requires high-power driven-end equipment, such as generators and brakes, which increases the complexity and cost of the test. If the coaxial motor to be tested is a coaxial motor, one coaxial motor can be used to test the other coaxial motor, and the brake used in the traditional towing test is replaced with a resistor box connected to the generator end, simplifying the test process.

[0005] In view of this, the present invention provides a motor self-test method based on a coaxial motor. Summary of the invention

[0006] The purpose of the present invention is to provide a motor self-test method based on a coaxial motor in view of the deficiencies in the prior art.

[0007] In order to solve the above technical problems, the following technical solutions are adopted:

[0008] A motor self-test method based on a coaxial motor includes a motor group, wherein the motor group includes two or more coaxially arranged coaxial motors, that is, the motors in the motor group are coaxial motor 1, coaxial motor 2, ... coaxial motor n, wherein n ≥ 3, one of the coaxial motors is selected, and the selected coaxial motor is tested by using the remaining coaxial motors, specifically including the following steps:

[0009] S1: connecting the coaxial motor 2, the coaxial motor 3, ... the coaxial motor n and a load resistor with an adjustable size to serve as a load group coaxial generator, so that the load group coaxial generator and the load resistor jointly act as a load;

[0010] S2: Power on the coaxial motor 1 to be tested, and the load group coaxial generator will start to rotate under the drive of the coaxial motor 1, so as to realize the test of the coaxial motor 1. In this process, the performance of the coaxial motor 1 is evaluated by observing the operating status of the coaxial generator and the coaxial motor 1 of the test load group and measuring relevant performance parameters;

[0011] S3: According to the test requirements, adjust the size of the load resistance to simulate the load of the motor in actual work, then continue to run the coaxial motor 1, and test the operating status of the load group coaxial generator and coaxial motor 1 again;

[0012] S4: Repeat step S3, each time increasing the load resistance of the coaxial generator of the load group by P ohms, where P is 0.5-1, until the load resistance of the coaxial generator of the load group reaches the measurement limit value; thereby obtaining the performance curve of the tested coaxial motor 1 under different loads.

[0013] A further improvement based on the above technical solution is that in step S2, the load group coaxial generator and the load resistor jointly play the role of load. According to the motor equation, it can be obtained that: .

[0014] A further improvement based on the technical solution is that step S1 also includes: when testing, the motor group is placed on a test bench, wherein the coaxial motor 1 and the load group coaxial generator are both connected to test instruments for measuring voltage, current, frequency and power.

[0015] A further improvement based on the technical solution is that the test instrument located on one side of the coaxial motor is connected to a frequency converter.

[0016] A further improvement based on the technical solution is that the test instrument located on one side of the load group coaxial generator is connected to a load resistor.

[0017] A further improvement based on the technical solution is that the load resistor is a resistor box with adjustable resistance.

[0018] A further improvement based on the technical solution is that in step S4, the calculation formula of the performance curve of the coaxial motor 1 under different loads is as follows:

[0019] in, is the coaxial motor efficiency, is the input voltage, is the input current, is the output voltage, is the output current, is the power factor.

[0020] A further improvement based on the technical solution is that the coaxial motor is connected to a driver, the driver is connected to a programmable logic controller, the programmable logic controller is communicatively connected to a host computer, and the programmable logic controller is used to receive a motor control signal sent by the host computer and forward the motor control signal to the driver.

[0021] A further improvement based on the technical solution is that the programmable logic controller is connected to a data display device, and the data display device is used to display the real-time control parameters of the programmable logic controller.

[0022] A further improvement based on the technical solution is that the programmable logic controller is connected to a safety control device, and the safety control device is used to control the coaxial motor to stop running when the continuous running time of the motor to be tested exceeds a preset time threshold; or to control the coaxial motor to stop running when the parameter value of the current signal characteristic parameter and / or the parameter value of the vibration signal characteristic parameter of the coaxial motor to be tested exceeds a preset safety threshold.

[0023] The above technical solution has the following beneficial effects:

[0024] The present invention provides a motor self-test method based on a coaxial motor. The present invention utilizes mutual testing between coaxial motors: by including more than three coaxial motors in a motor group, one coaxial motor is used to test another coaxial motor. This method replaces the brake used in the traditional towing test with a resistor box connected to the generator end, simplifies the test process, and also reduces the cost.

[0025] Adjust the load torque by adjusting the load resistance: According to the motor equation, the load torque can be adjusted by adjusting the load resistance. This method makes the load adjustment more convenient and also improves the flexibility of the test.

[0026] By setting up resistor boxes with different powers and adjusting their internal resistance, the requirements of power adjustment and high-power testing can be achieved: Compared with the traditional test method that requires high-power driven-end equipment, this method can set up resistor boxes with different powers and adjust their internal resistance to achieve power adjustment and high-power testing requirements. This method reduces the complexity and cost of the test.

[0027] The beneficial effects of this technical solution are as follows:

[0028] 1. Simplify the test process: The present invention uses one of the coaxial motors to test the other one, and replaces the brake used in the traditional towing test with a resistor box connected to the generating end, thereby simplifying the test process, avoiding the tedious operation of disassembling all mechanical shafts in the traditional method, and saving time and manpower.

[0029] 2. Reduce costs: Compared with traditional testing methods, the present invention achieves the requirements of adjustable power and high-power testing by setting resistance boxes of different powers and adjusting their internal resistance. It does not need to be equipped with high-power driven-end equipment, thus reducing the complexity and cost of the test.

[0030] 3. Reduce installation troubles: The present invention avoids the problems of difficult concentricity adjustment and troublesome motor installation in traditional drag tests, making the installation of the motor easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below in conjunction with the accompanying drawings:

[0032] Figure 1 This is an overall diagram of a motor self-test method based on a coaxial motor according to an embodiment of the present invention.

[0033] Figure 2 This is a comparison diagram of the efficiency of a coaxial motor using load resistance as a variable according to an embodiment of the present invention and a conventional tested tow motor.

[0034] Figure 3 This is a comparison diagram of the efficiency of a coaxial motor using input current as a variable according to an embodiment of the present invention and a conventional tested twin-drive motor.

[0035] Figure 4 This is an appearance diagram of a coaxial motor used for testing according to an embodiment of the present invention.

[0036] Figure 5 It is an overall diagram of the motor testing method of the prior art according to the embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0038] See also Figure 1-Figure 4A motor self-test method based on a coaxial motor includes a motor group, wherein the motor group includes two or more coaxially arranged coaxial motors, that is, the motors in the motor group are coaxial motor one, coaxial motor two...coaxial motor n, wherein n≥3, one of the coaxial motors is selected, and the selected coaxial motor is tested using the remaining coaxial motors, wherein this example uses two coaxial motors to illustrate the embodiment, wherein this embodiment uses a permanent magnet coaxial motor for test illustration.

[0039] The specific steps include:

[0040] S1: Prepare a motor group, which includes two coaxial motors, namely coaxial motor one and coaxial motor two. The rated voltage of these two motors is 400VDC, the rated frequency is 400Hz, and the rated power is 20kW. Connect the coaxial motor two and an adjustable load resistor as a load group coaxial generator, and use the load group coaxial generator and the load resistor to act as a load together. The other coaxial motor one is the tested motor, and the load resistor can use an existing test resistor box. The role of this resistor is to simulate the load of the motor in actual work. It should be noted that the size of the load resistor can be adjusted according to actual needs to meet different test requirements.

[0041] S2: Power on the coaxial motor 1 to be tested to start running. The load group coaxial generator will start to rotate under the drive of the coaxial motor 1, so as to test the coaxial motor 1. In this process, the performance of the coaxial motor 1 is evaluated by observing the running status of the coaxial generator and the coaxial motor 1 of the test load group and measuring related performance parameters.

[0042] S3: According to the test requirements, adjust the size of the load resistance to simulate the load of the motor in actual work, then continue to run the coaxial motor one, and test the operating status of the load group coaxial generator and coaxial motor one again.

[0043] S4: Repeat step S3, each time increasing the load resistance of the load group coaxial generator by P ohms, where P is 0.5-1 in this embodiment, until the load resistance of the load group coaxial generator reaches the measurement limit value of 500 ohms; thereby obtaining the performance curve of the tested coaxial motor 1 under different loads.

[0044] In this way, the motor can be self-tested effectively, and the test conditions can be adjusted according to actual needs to meet different test requirements.

[0045] As a further explanation of this embodiment, in step S2, the load group coaxial generator and the load resistor jointly play the role of load. According to the motor equation, it can be obtained that:

[0046] .

[0047] It can be seen from the formula that the load torque can be adjusted by simply adjusting the load resistance.

[0048] As a further illustration of this embodiment, the step S1 also includes: when testing, the motor group is placed on a test bench, wherein the coaxial motor 1 and the load group coaxial generator are both connected to test instruments for measuring voltage, current, frequency and power.

[0049] As a further illustration of this embodiment, the test instrument located on one side of the coaxial motor is connected to a frequency converter.

[0050] As a further illustration of this embodiment, a test meter located on one side of the load group coaxial generator is connected to a load resistor.

[0051] As a further explanation of this embodiment, see Figure 2 and Figure 3 This is a comparison chart of the efficiency of the coaxial motor and the existing tested towing motor (500RPM). Figure 2 By adjusting the load resistance (resistance box), the efficiency changes of the coaxial motor and the towing motor can be obtained. Figure 3 By adjusting the size of the load resistor (resistance box), the corresponding input current also changes. In order to facilitate the analysis of the efficiency of the coaxial motor, a device that reads voltage and current (such as a power analyzer) can be installed at the input and output ends.

[0052] The efficiency of a coaxial motor is the ratio of output power to input power, as shown in the formula.

[0053]

[0054] in, is the coaxial motor efficiency, is the input voltage, is the input current, is the output voltage, is the output current, is the power factor.

[0055] When the current increases, the loss of the motor itself will gradually increase, and as the temperature rises, the resistance of the copper wire will increase, which will lead to an increase in the power consumption of the motor itself and a decrease in the efficiency of the coaxial motor.

[0056] As a further explanation of this embodiment, the coaxial motor is connected to a driver, the driver is connected to a programmable logic controller, the programmable logic controller is communicatively connected to a host computer, and the programmable logic controller is used to receive a motor control signal sent by the host computer and forward the motor control signal to the driver.

[0057] As a further illustration of this embodiment, the programmable logic controller is connected to a data display device, and the data display device is used to display the real-time control parameters of the programmable logic controller.

[0058] As a further explanation of this embodiment, the programmable logic controller is connected to a safety control device, which is used to control the coaxial motor to stop running when the continuous running time of the motor to be tested exceeds a preset time threshold; or to control the coaxial motor to stop running when the parameter value of the current signal characteristic parameter and / or the parameter value of the vibration signal characteristic parameter of the coaxial motor to be tested exceeds a preset safety threshold.

[0059] Compared with the existing technology, this technical solution mainly solves the following technical problems: 1) the technical problem that the mechanical shaft disassembly during motor replacement is cumbersome and time-consuming; 2) the existing motor testing method requires high-power driven-end equipment, such as generators, brakes, etc., when testing high-power motors, which increases the complexity and cost of the test.

[0060] Since this technical solution can be widely used in application fields such as motor manufacturing, motor testing, and electronic equipment self-testing. First, for the motor manufacturing industry, this technical solution can effectively reduce the assembly and testing time of the motor, improve production efficiency, and reduce production costs. Secondly, for the motor testing industry, this technical solution can simplify the testing process, improve test accuracy, meet the testing needs of high-power motors, and has great market potential. Finally, for the field of electronic equipment self-testing, this technical solution can realize the self-testing of the equipment, improve the reliability and stability of the equipment, and meet the development needs of intelligent and automated equipment.

[0061] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A motor self-test method based on a coaxial motor, characterized in that: The method comprises a motor group, wherein the motor group comprises three or more coaxial motors arranged coaxially, that is, the motors in the motor group are coaxial motor 1, coaxial motor 2, ... coaxial motor n, wherein n≥3, one of the coaxial motors is selected, and the selected coaxial motor is tested by using the remaining coaxial motors, specifically comprising the following steps: S1: connecting the coaxial motor 2, the coaxial motor 3, ... the coaxial motor n and a load resistor with an adjustable size to serve as a load group coaxial generator, so that the load group coaxial generator and the load resistor jointly act as a load; The step S1 also includes: when testing, the motor group is placed on a test bench, wherein the coaxial motor 1 and the load group coaxial generator are both connected to test instruments for measuring voltage, current, frequency and power; S2: Power on the coaxial motor 1 to be tested, and the load group coaxial generator will start to rotate under the drive of the coaxial motor 1, so as to realize the test of the coaxial motor 1. In this process, the performance of the coaxial motor 1 is evaluated by observing the operating status of the coaxial generator and the coaxial motor 1 of the test load group and measuring relevant performance parameters; S3: According to the test requirements, adjust the size of the load resistance to simulate the load of the motor in actual work, then continue to run the coaxial motor 1, and test the operating status of the load group coaxial generator and coaxial motor 1 again; S4: repeating step S3, each time increasing the load resistance of the coaxial generator of the load group by P ohms, where P is 0.5-1, until the load resistance of the coaxial generator of the load group reaches the measurement limit value; thereby obtaining the performance curve of the tested coaxial motor 1 under different loads; In step S4, the calculation formula of the performance curve of the coaxial motor 1 under different loads is as follows: , in, is the coaxial motor efficiency, is the input voltage, is the input current, is the output voltage, is the output current, is the power factor; The coaxial motor is connected to a driver, the driver is connected to a programmable logic controller, the programmable logic controller is in communication connection with a host computer, and the programmable logic controller is used to receive a motor control signal sent by the host computer and forward the motor control signal to the driver.

2. The motor self-test method based on a coaxial motor according to claim 1, characterized in that: In step S2, the load group coaxial generator and the load resistor act together as the load. According to the motor equation, it can be obtained that: 。 3. The motor self-test method based on a coaxial motor according to claim 1, characterized in that: The test instrument located at one side of the coaxial motor is connected to a frequency converter.

4. The motor self-test method based on a coaxial motor according to claim 1, characterized in that: The test meter located on one side of the load group coaxial generator is connected with a load resistor.

5. The motor self-test method based on a coaxial motor according to claim 1, characterized in that: The load resistor is a resistor box with adjustable resistance.

6. The motor self-test method based on a coaxial motor according to claim 1, characterized in that: The programmable logic controller is connected to a data display device, and the data display device is used to display the real-time control parameters of the programmable logic controller.

7. The motor self-test method based on a coaxial motor according to claim 1, characterized in that: The programmable logic controller is connected to a safety control device, which is used to control the coaxial motor to stop running when the continuous running time of the motor to be tested exceeds a preset time threshold; or to control the coaxial motor to stop running when the parameter value of the current signal characteristic parameter and / or the parameter value of the vibration signal characteristic parameter of the coaxial motor to be tested exceeds a preset safety threshold.

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